Sublevel caving method well-free rapid grooving method under complex mining condition

The invention provides a sublevel caving method well-free rapid grooving method under complex mining conditions. When a sublevel caving method is adopted for mining under the adverse conditions of ore rock breaking, complex and changeable ore body forms and the like, a series of prominent problems of high cutting groove forming difficulty, low efficiency, poor safety and the like exist, and the invention provides a well-free rapid grooving method. The method comprises the following steps of: firstly, finishing initial groove broaching of the whole subsection at the outermost convex part of the hanging wall boundary of a subsection ore body in a manner of combining a cutting gate way, a wedge-shaped gun row and a vertical parallel gun row, and finishing groove broaching of other access paths in the subsection in a groove expanding manner by utilizing the cutting gate way and the vertical parallel gun row; according to the method, the problems of high construction difficulty, poor safety, high operation cost, l